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We use a PCA9450BHNY to supply an i.MX8 Nano.
During production testing, we measure the Voltage of Buck 1 (V_0V95_SOC) and Buck2 (V_0V85_ARM) an check the voltage Limits of 0.85V +/- 2%.
During this test, the CPU stops and the flash is unprogrammed.
Beginning in August 2026 the Voltage rises and violates the upper limit at some boards.
Not only the individual Voltages of a board rises, also the mean value of thousands of boards.
There was an PCN (202502007F01 : PCA9450 / MP90 Dual Wafer Fabrication Source Expansion
from SSMC to PSMC) last year (25.04.2025)
Can the new wafer fab a possible source of the problem?
Hello!
Thank you for your patience. I’m currently checking this internally and will get back to you as soon as I have an update.
An internal investigation revealed that the problem was caused by worn test probes contacting the test points on the printed circuit board. We replaced the test probes, and the voltages are now within the permissible range.